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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.nio.channels; | ||
| 27 | |||
| 28 | import java.io.IOException; | ||
| 29 | import java.net.Socket; | ||
| 30 | import java.net.SocketOption; | ||
| 31 | import java.net.SocketAddress; | ||
| 32 | import java.nio.ByteBuffer; | ||
| 33 | import java.nio.channels.spi.AbstractSelectableChannel; | ||
| 34 | import java.nio.channels.spi.SelectorProvider; | ||
| 35 | |||
| 36 | /** | ||
| 37 | * A selectable channel for stream-oriented connecting sockets. | ||
| 38 | * | ||
| 39 | * <p> A socket channel is created by invoking one of the {@link #open open} | ||
| 40 | * methods of this class. It is not possible to create a channel for an arbitrary, | ||
| 41 | * pre-existing socket. A newly-created socket channel is open but not yet | ||
| 42 | * connected. An attempt to invoke an I/O operation upon an unconnected | ||
| 43 | * channel will cause a {@link NotYetConnectedException} to be thrown. A | ||
| 44 | * socket channel can be connected by invoking its {@link #connect connect} | ||
| 45 | * method; once connected, a socket channel remains connected until it is | ||
| 46 | * closed. Whether or not a socket channel is connected may be determined by | ||
| 47 | * invoking its {@link #isConnected isConnected} method. | ||
| 48 | * | ||
| 49 | * <p> Socket channels support <i>non-blocking connection:</i> A socket | ||
| 50 | * channel may be created and the process of establishing the link to the | ||
| 51 | * remote socket may be initiated via the {@link #connect connect} method for | ||
| 52 | * later completion by the {@link #finishConnect finishConnect} method. | ||
| 53 | * Whether or not a connection operation is in progress may be determined by | ||
| 54 | * invoking the {@link #isConnectionPending isConnectionPending} method. | ||
| 55 | * | ||
| 56 | * <p> Socket channels support <i>asynchronous shutdown,</i> which is similar | ||
| 57 | * to the asynchronous close operation specified in the {@link Channel} class. | ||
| 58 | * If the input side of a socket is shut down by one thread while another | ||
| 59 | * thread is blocked in a read operation on the socket's channel, then the read | ||
| 60 | * operation in the blocked thread will complete without reading any bytes and | ||
| 61 | * will return <tt>-1</tt>. If the output side of a socket is shut down by one | ||
| 62 | * thread while another thread is blocked in a write operation on the socket's | ||
| 63 | * channel, then the blocked thread will receive an {@link | ||
| 64 | * AsynchronousCloseException}. | ||
| 65 | * | ||
| 66 | * <p> Socket options are configured using the {@link #setOption(SocketOption,Object) | ||
| 67 | * setOption} method. Socket channels support the following options: | ||
| 68 | * <blockquote> | ||
| 69 | * <table border> | ||
| 70 | * <tr> | ||
| 71 | * <th>Option Name</th> | ||
| 72 | * <th>Description</th> | ||
| 73 | * </tr> | ||
| 74 | * <tr> | ||
| 75 | * <td> {@link java.net.StandardSocketOptions#SO_SNDBUF SO_SNDBUF} </td> | ||
| 76 | * <td> The size of the socket send buffer </td> | ||
| 77 | * </tr> | ||
| 78 | * <tr> | ||
| 79 | * <td> {@link java.net.StandardSocketOptions#SO_RCVBUF SO_RCVBUF} </td> | ||
| 80 | * <td> The size of the socket receive buffer </td> | ||
| 81 | * </tr> | ||
| 82 | * <tr> | ||
| 83 | * <td> {@link java.net.StandardSocketOptions#SO_KEEPALIVE SO_KEEPALIVE} </td> | ||
| 84 | * <td> Keep connection alive </td> | ||
| 85 | * </tr> | ||
| 86 | * <tr> | ||
| 87 | * <td> {@link java.net.StandardSocketOptions#SO_REUSEADDR SO_REUSEADDR} </td> | ||
| 88 | * <td> Re-use address </td> | ||
| 89 | * </tr> | ||
| 90 | * <tr> | ||
| 91 | * <td> {@link java.net.StandardSocketOptions#SO_LINGER SO_LINGER} </td> | ||
| 92 | * <td> Linger on close if data is present (when configured in blocking mode | ||
| 93 | * only) </td> | ||
| 94 | * </tr> | ||
| 95 | * <tr> | ||
| 96 | * <td> {@link java.net.StandardSocketOptions#TCP_NODELAY TCP_NODELAY} </td> | ||
| 97 | * <td> Disable the Nagle algorithm </td> | ||
| 98 | * </tr> | ||
| 99 | * </table> | ||
| 100 | * </blockquote> | ||
| 101 | * Additional (implementation specific) options may also be supported. | ||
| 102 | * | ||
| 103 | * <p> Socket channels are safe for use by multiple concurrent threads. They | ||
| 104 | * support concurrent reading and writing, though at most one thread may be | ||
| 105 | * reading and at most one thread may be writing at any given time. The {@link | ||
| 106 | * #connect connect} and {@link #finishConnect finishConnect} methods are | ||
| 107 | * mutually synchronized against each other, and an attempt to initiate a read | ||
| 108 | * or write operation while an invocation of one of these methods is in | ||
| 109 | * progress will block until that invocation is complete. </p> | ||
| 110 | * | ||
| 111 | * @author Mark Reinhold | ||
| 112 | * @author JSR-51 Expert Group | ||
| 113 | * @since 1.4 | ||
| 114 | */ | ||
| 115 | |||
| 116 | public abstract class SocketChannel | ||
| 117 | extends AbstractSelectableChannel | ||
| 118 | implements ByteChannel, ScatteringByteChannel, GatheringByteChannel, NetworkChannel | ||
| 119 | { | ||
| 120 | |||
| 121 | /** | ||
| 122 | * Initializes a new instance of this class. | ||
| 123 | */ | ||
| 124 | protected SocketChannel(SelectorProvider provider) { | ||
| 125 | super(provider); | ||
| 126 | } | ||
| 127 | |||
| 128 | /** | ||
| 129 | * Opens a socket channel. | ||
| 130 | * | ||
| 131 | * <p> The new channel is created by invoking the {@link | ||
| 132 | * java.nio.channels.spi.SelectorProvider#openSocketChannel | ||
| 133 | * openSocketChannel} method of the system-wide default {@link | ||
| 134 | * java.nio.channels.spi.SelectorProvider} object. </p> | ||
| 135 | * | ||
| 136 | * @return A new socket channel | ||
| 137 | * | ||
| 138 | * @throws IOException | ||
| 139 | * If an I/O error occurs | ||
| 140 | */ | ||
| 141 | public static SocketChannel open() throws IOException { | ||
| 142 | return SelectorProvider.provider().openSocketChannel(); | ||
| 143 | } | ||
| 144 | |||
| 145 | /** | ||
| 146 | * Opens a socket channel and connects it to a remote address. | ||
| 147 | * | ||
| 148 | * <p> This convenience method works as if by invoking the {@link #open()} | ||
| 149 | * method, invoking the {@link #connect(SocketAddress) connect} method upon | ||
| 150 | * the resulting socket channel, passing it <tt>remote</tt>, and then | ||
| 151 | * returning that channel. </p> | ||
| 152 | * | ||
| 153 | * @param remote | ||
| 154 | * The remote address to which the new channel is to be connected | ||
| 155 | * | ||
| 156 | * @throws AsynchronousCloseException | ||
| 157 | * If another thread closes this channel | ||
| 158 | * while the connect operation is in progress | ||
| 159 | * | ||
| 160 | * @throws ClosedByInterruptException | ||
| 161 | * If another thread interrupts the current thread | ||
| 162 | * while the connect operation is in progress, thereby | ||
| 163 | * closing the channel and setting the current thread's | ||
| 164 | * interrupt status | ||
| 165 | * | ||
| 166 | * @throws UnresolvedAddressException | ||
| 167 | * If the given remote address is not fully resolved | ||
| 168 | * | ||
| 169 | * @throws UnsupportedAddressTypeException | ||
| 170 | * If the type of the given remote address is not supported | ||
| 171 | * | ||
| 172 | * @throws SecurityException | ||
| 173 | * If a security manager has been installed | ||
| 174 | * and it does not permit access to the given remote endpoint | ||
| 175 | * | ||
| 176 | * @throws IOException | ||
| 177 | * If some other I/O error occurs | ||
| 178 | */ | ||
| 179 | public static SocketChannel open(SocketAddress remote) | ||
| 180 | throws IOException | ||
| 181 | { | ||
| 182 | SocketChannel sc = open(); | ||
| 183 | try { | ||
| 184 | sc.connect(remote); | ||
| 185 | } catch (Throwable x) { | ||
| 186 | try { | ||
| 187 | sc.close(); | ||
| 188 | } catch (Throwable suppressed) { | ||
| 189 | x.addSuppressed(suppressed); | ||
| 190 | } | ||
| 191 | throw x; | ||
| 192 | } | ||
| 193 | assert sc.isConnected(); | ||
| 194 | return sc; | ||
| 195 | } | ||
| 196 | |||
| 197 | /** | ||
| 198 | * Returns an operation set identifying this channel's supported | ||
| 199 | * operations. | ||
| 200 | * | ||
| 201 | * <p> Socket channels support connecting, reading, and writing, so this | ||
| 202 | * method returns <tt>(</tt>{@link SelectionKey#OP_CONNECT} | ||
| 203 | * <tt>|</tt> {@link SelectionKey#OP_READ} <tt>|</tt> {@link | ||
| 204 | * SelectionKey#OP_WRITE}<tt>)</tt>. </p> | ||
| 205 | * | ||
| 206 | * @return The valid-operation set | ||
| 207 | */ | ||
| 208 | public final int validOps() { | ||
| 209 | return (SelectionKey.OP_READ | ||
| 210 | | SelectionKey.OP_WRITE | ||
| 211 | | SelectionKey.OP_CONNECT); | ||
| 212 | } | ||
| 213 | |||
| 214 | |||
| 215 | // -- Socket-specific operations -- | ||
| 216 | |||
| 217 | /** | ||
| 218 | * @throws ConnectionPendingException | ||
| 219 | * If a non-blocking connect operation is already in progress on | ||
| 220 | * this channel | ||
| 221 | * @throws AlreadyBoundException {@inheritDoc} | ||
| 222 | * @throws UnsupportedAddressTypeException {@inheritDoc} | ||
| 223 | * @throws ClosedChannelException {@inheritDoc} | ||
| 224 | * @throws IOException {@inheritDoc} | ||
| 225 | * | ||
| 226 | * @since 1.7 | ||
| 227 | */ | ||
| 228 | @Override | ||
| 229 | public abstract SocketChannel bind(SocketAddress local) | ||
| 230 | throws IOException; | ||
| 231 | |||
| 232 | /** | ||
| 233 | * @throws UnsupportedOperationException {@inheritDoc} | ||
| 234 | * @throws IllegalArgumentException {@inheritDoc} | ||
| 235 | * @throws ClosedChannelException {@inheritDoc} | ||
| 236 | * @throws IOException {@inheritDoc} | ||
| 237 | * | ||
| 238 | * @since 1.7 | ||
| 239 | */ | ||
| 240 | @Override | ||
| 241 | public abstract <T> SocketChannel setOption(SocketOption<T> name, T value) | ||
| 242 | throws IOException; | ||
| 243 | |||
| 244 | /** | ||
| 245 | * Shutdown the connection for reading without closing the channel. | ||
| 246 | * | ||
| 247 | * <p> Once shutdown for reading then further reads on the channel will | ||
| 248 | * return {@code -1}, the end-of-stream indication. If the input side of the | ||
| 249 | * connection is already shutdown then invoking this method has no effect. | ||
| 250 | * | ||
| 251 | * @return The channel | ||
| 252 | * | ||
| 253 | * @throws NotYetConnectedException | ||
| 254 | * If this channel is not yet connected | ||
| 255 | * @throws ClosedChannelException | ||
| 256 | * If this channel is closed | ||
| 257 | * @throws IOException | ||
| 258 | * If some other I/O error occurs | ||
| 259 | * | ||
| 260 | * @since 1.7 | ||
| 261 | */ | ||
| 262 | public abstract SocketChannel shutdownInput() throws IOException; | ||
| 263 | |||
| 264 | /** | ||
| 265 | * Shutdown the connection for writing without closing the channel. | ||
| 266 | * | ||
| 267 | * <p> Once shutdown for writing then further attempts to write to the | ||
| 268 | * channel will throw {@link ClosedChannelException}. If the output side of | ||
| 269 | * the connection is already shutdown then invoking this method has no | ||
| 270 | * effect. | ||
| 271 | * | ||
| 272 | * @return The channel | ||
| 273 | * | ||
| 274 | * @throws NotYetConnectedException | ||
| 275 | * If this channel is not yet connected | ||
| 276 | * @throws ClosedChannelException | ||
| 277 | * If this channel is closed | ||
| 278 | * @throws IOException | ||
| 279 | * If some other I/O error occurs | ||
| 280 | * | ||
| 281 | * @since 1.7 | ||
| 282 | */ | ||
| 283 | public abstract SocketChannel shutdownOutput() throws IOException; | ||
| 284 | |||
| 285 | /** | ||
| 286 | * Retrieves a socket associated with this channel. | ||
| 287 | * | ||
| 288 | * <p> The returned object will not declare any public methods that are not | ||
| 289 | * declared in the {@link java.net.Socket} class. </p> | ||
| 290 | * | ||
| 291 | * @return A socket associated with this channel | ||
| 292 | */ | ||
| 293 | public abstract Socket socket(); | ||
| 294 | |||
| 295 | /** | ||
| 296 | * Tells whether or not this channel's network socket is connected. | ||
| 297 | * | ||
| 298 | * @return <tt>true</tt> if, and only if, this channel's network socket | ||
| 299 | * is {@link #isOpen open} and connected | ||
| 300 | */ | ||
| 301 | public abstract boolean isConnected(); | ||
| 302 | |||
| 303 | /** | ||
| 304 | * Tells whether or not a connection operation is in progress on this | ||
| 305 | * channel. </p> | ||
| 306 | * | ||
| 307 | * @return <tt>true</tt> if, and only if, a connection operation has been | ||
| 308 | * initiated on this channel but not yet completed by invoking the | ||
| 309 | * {@link #finishConnect finishConnect} method | ||
| 310 | */ | ||
| 311 | public abstract boolean isConnectionPending(); | ||
| 312 | |||
| 313 | /** | ||
| 314 | * Connects this channel's socket. | ||
| 315 | * | ||
| 316 | * <p> If this channel is in non-blocking mode then an invocation of this | ||
| 317 | * method initiates a non-blocking connection operation. If the connection | ||
| 318 | * is established immediately, as can happen with a local connection, then | ||
| 319 | * this method returns <tt>true</tt>. Otherwise this method returns | ||
| 320 | * <tt>false</tt> and the connection operation must later be completed by | ||
| 321 | * invoking the {@link #finishConnect finishConnect} method. | ||
| 322 | * | ||
| 323 | * <p> If this channel is in blocking mode then an invocation of this | ||
| 324 | * method will block until the connection is established or an I/O error | ||
| 325 | * occurs. | ||
| 326 | * | ||
| 327 | * <p> This method performs exactly the same security checks as the {@link | ||
| 328 | * java.net.Socket} class. That is, if a security manager has been | ||
| 329 | * installed then this method verifies that its {@link | ||
| 330 | * java.lang.SecurityManager#checkConnect checkConnect} method permits | ||
| 331 | * connecting to the address and port number of the given remote endpoint. | ||
| 332 | * | ||
| 333 | * <p> This method may be invoked at any time. If a read or write | ||
| 334 | * operation upon this channel is invoked while an invocation of this | ||
| 335 | * method is in progress then that operation will first block until this | ||
| 336 | * invocation is complete. If a connection attempt is initiated but fails, | ||
| 337 | * that is, if an invocation of this method throws a checked exception, | ||
| 338 | * then the channel will be closed. </p> | ||
| 339 | * | ||
| 340 | * @param remote | ||
| 341 | * The remote address to which this channel is to be connected | ||
| 342 | * | ||
| 343 | * @return <tt>true</tt> if a connection was established, | ||
| 344 | * <tt>false</tt> if this channel is in non-blocking mode | ||
| 345 | * and the connection operation is in progress | ||
| 346 | * | ||
| 347 | * @throws AlreadyConnectedException | ||
| 348 | * If this channel is already connected | ||
| 349 | * | ||
| 350 | * @throws ConnectionPendingException | ||
| 351 | * If a non-blocking connection operation is already in progress | ||
| 352 | * on this channel | ||
| 353 | * | ||
| 354 | * @throws ClosedChannelException | ||
| 355 | * If this channel is closed | ||
| 356 | * | ||
| 357 | * @throws AsynchronousCloseException | ||
| 358 | * If another thread closes this channel | ||
| 359 | * while the connect operation is in progress | ||
| 360 | * | ||
| 361 | * @throws ClosedByInterruptException | ||
| 362 | * If another thread interrupts the current thread | ||
| 363 | * while the connect operation is in progress, thereby | ||
| 364 | * closing the channel and setting the current thread's | ||
| 365 | * interrupt status | ||
| 366 | * | ||
| 367 | * @throws UnresolvedAddressException | ||
| 368 | * If the given remote address is not fully resolved | ||
| 369 | * | ||
| 370 | * @throws UnsupportedAddressTypeException | ||
| 371 | * If the type of the given remote address is not supported | ||
| 372 | * | ||
| 373 | * @throws SecurityException | ||
| 374 | * If a security manager has been installed | ||
| 375 | * and it does not permit access to the given remote endpoint | ||
| 376 | * | ||
| 377 | * @throws IOException | ||
| 378 | * If some other I/O error occurs | ||
| 379 | */ | ||
| 380 | public abstract boolean connect(SocketAddress remote) throws IOException; | ||
| 381 | |||
| 382 | /** | ||
| 383 | * Finishes the process of connecting a socket channel. | ||
| 384 | * | ||
| 385 | * <p> A non-blocking connection operation is initiated by placing a socket | ||
| 386 | * channel in non-blocking mode and then invoking its {@link #connect | ||
| 387 | * connect} method. Once the connection is established, or the attempt has | ||
| 388 | * failed, the socket channel will become connectable and this method may | ||
| 389 | * be invoked to complete the connection sequence. If the connection | ||
| 390 | * operation failed then invoking this method will cause an appropriate | ||
| 391 | * {@link java.io.IOException} to be thrown. | ||
| 392 | * | ||
| 393 | * <p> If this channel is already connected then this method will not block | ||
| 394 | * and will immediately return <tt>true</tt>. If this channel is in | ||
| 395 | * non-blocking mode then this method will return <tt>false</tt> if the | ||
| 396 | * connection process is not yet complete. If this channel is in blocking | ||
| 397 | * mode then this method will block until the connection either completes | ||
| 398 | * or fails, and will always either return <tt>true</tt> or throw a checked | ||
| 399 | * exception describing the failure. | ||
| 400 | * | ||
| 401 | * <p> This method may be invoked at any time. If a read or write | ||
| 402 | * operation upon this channel is invoked while an invocation of this | ||
| 403 | * method is in progress then that operation will first block until this | ||
| 404 | * invocation is complete. If a connection attempt fails, that is, if an | ||
| 405 | * invocation of this method throws a checked exception, then the channel | ||
| 406 | * will be closed. </p> | ||
| 407 | * | ||
| 408 | * @return <tt>true</tt> if, and only if, this channel's socket is now | ||
| 409 | * connected | ||
| 410 | * | ||
| 411 | * @throws NoConnectionPendingException | ||
| 412 | * If this channel is not connected and a connection operation | ||
| 413 | * has not been initiated | ||
| 414 | * | ||
| 415 | * @throws ClosedChannelException | ||
| 416 | * If this channel is closed | ||
| 417 | * | ||
| 418 | * @throws AsynchronousCloseException | ||
| 419 | * If another thread closes this channel | ||
| 420 | * while the connect operation is in progress | ||
| 421 | * | ||
| 422 | * @throws ClosedByInterruptException | ||
| 423 | * If another thread interrupts the current thread | ||
| 424 | * while the connect operation is in progress, thereby | ||
| 425 | * closing the channel and setting the current thread's | ||
| 426 | * interrupt status | ||
| 427 | * | ||
| 428 | * @throws IOException | ||
| 429 | * If some other I/O error occurs | ||
| 430 | */ | ||
| 431 | public abstract boolean finishConnect() throws IOException; | ||
| 432 | |||
| 433 | /** | ||
| 434 | * Returns the remote address to which this channel's socket is connected. | ||
| 435 | * | ||
| 436 | * <p> Where the channel is bound and connected to an Internet Protocol | ||
| 437 | * socket address then the return value from this method is of type {@link | ||
| 438 | * java.net.InetSocketAddress}. | ||
| 439 | * | ||
| 440 | * @return The remote address; {@code null} if the channel's socket is not | ||
| 441 | * connected | ||
| 442 | * | ||
| 443 | * @throws ClosedChannelException | ||
| 444 | * If the channel is closed | ||
| 445 | * @throws IOException | ||
| 446 | * If an I/O error occurs | ||
| 447 | * | ||
| 448 | * @since 1.7 | ||
| 449 | */ | ||
| 450 | public abstract SocketAddress getRemoteAddress() throws IOException; | ||
| 451 | |||
| 452 | // -- ByteChannel operations -- | ||
| 453 | |||
| 454 | /** | ||
| 455 | * @throws NotYetConnectedException | ||
| 456 | * If this channel is not yet connected | ||
| 457 | */ | ||
| 458 | public abstract int read(ByteBuffer dst) throws IOException; | ||
| 459 | |||
| 460 | /** | ||
| 461 | * @throws NotYetConnectedException | ||
| 462 | * If this channel is not yet connected | ||
| 463 | */ | ||
| 464 | public abstract long read(ByteBuffer[] dsts, int offset, int length) | ||
| 465 | throws IOException; | ||
| 466 | |||
| 467 | /** | ||
| 468 | * @throws NotYetConnectedException | ||
| 469 | * If this channel is not yet connected | ||
| 470 | */ | ||
| 471 | public final long read(ByteBuffer[] dsts) throws IOException { | ||
| 472 | return read(dsts, 0, dsts.length); | ||
| 473 | } | ||
| 474 | |||
| 475 | /** | ||
| 476 | * @throws NotYetConnectedException | ||
| 477 | * If this channel is not yet connected | ||
| 478 | */ | ||
| 479 | public abstract int write(ByteBuffer src) throws IOException; | ||
| 480 | |||
| 481 | /** | ||
| 482 | * @throws NotYetConnectedException | ||
| 483 | * If this channel is not yet connected | ||
| 484 | */ | ||
| 485 | public abstract long write(ByteBuffer[] srcs, int offset, int length) | ||
| 486 | throws IOException; | ||
| 487 | |||
| 488 | /** | ||
| 489 | * @throws NotYetConnectedException | ||
| 490 | * If this channel is not yet connected | ||
| 491 | */ | ||
| 492 | public final long write(ByteBuffer[] srcs) throws IOException { | ||
| 493 | return write(srcs, 0, srcs.length); | ||
| 494 | } | ||
| 495 | |||
| 496 | } | ||